Corner-strip.



Patented Oct. 7, I902.

W. N. McDONALD.

V CORNER STRIP. (Application filed Dec. 4, 1901.)

(N0 Model.)

I TEES Cl, FHUYOLITNOU WASHINGYON. D. C.

Grains.

\VILLIAM N. MCDONALD, OF HAVANA, CUBA.

SEEGEEXQATZON forming part of Letters Patent No. 710,880, dated October7, 1902.

Application filed December 4,1901. Serial llo. 84,702. (N0 model-1 Toall ZU7L077'L it Hut/j concern:

Be it known that 1, WILLIAM N. McDon- ALD, a citizen of the UnitedStates, residing at Havana, in the Island of Cuba, have in vented a newand useful Improvement in Corner-Strips, of which the following is aspecification.

My invention relates to an improvement in corner-strips for protectingand ornamenting concrete or mortar against abrasion or grinding, and itis designed that it shall be applicable to use in protecting Stairways,bridgecopings, corners of abutments, door-jambs, and, in fact, allcorners of concrete or monolithic structures which are to be guarded andprotected from breaking.

iVith the foregoing objects in view my invention consists in certainnovel features of construction and combinations of parts,which will behereinafter described, and pointed out in the claims.

In the accompanying drawings, Figures 1 and 2 show side elevations ofslightly-modified forms of protectingstrips. Fig. 3 is a cross-section.Fig. i is a view of a flight of stairs, showing several slightmodifications of the invention; and Fig. 5 is a similar view on asomewhat-enlarged scale, showing the application of the improvement to acurb and gutter.

The essential features comprise the outer strip A, which may be in anyform and ornamented, if desired, and the bonding portion B, integraltherewith or secured thereto. The protecting-strip may be made in avariety of shapes, as indicated in the drawings, and it might be rolledor cast in still other forms. The outer surface is adapted to protectthe corner to which it is applied and it forms the outer surface of thatportion to which it is applied. Its edges terminate or are embedded inor lie flush with the concrete or mortar, so that the outer surface ofthe protecting-strip forms a continuation thereof. The bonding portionor shank is likewise subject to indefinite variations. Two forms onlyare shown, one in Fig. 1 and another in'Fig. 2. In Fig. 1 it is in theform In this rib openings 1 1 are formed, thereby leaving interveningundercut or dovetailed projections 2 2, which latter are embedded in theconcrete or mortar, so that the protecting-strip is securely anchored inplace against the possibility of accidental displacement, in that waystrengthening the structure itself and protecting the projecting corneragainst abrasion. In the other form shown the rib is modified into theform of a series or plurality of undercut or dovetailed projections 3 3,which, like the projections 2 2 of the other form above described, aresunk or embedded in the concrete or mortar, where they are securely heldby virtue of their dovetailed formation against removal unless themasonry itself is torn away.

In Figs. at and 5, while all of the essential elements above describedare adhered to strictly, a variety of slight modifications areillustrated, the bonding device in most instances being a continuationof one edge of the protectingstrip.

The foregoing invention has been tested sufficiently to demonstrate itsthorough practicability. Besides its efficiency it has the merit ofeconomical construction.

It is evident that other slight changes hesides those shown anddescribed might be resorted to in the form and arrangement of theessentials of the invention without departing from the spirit and scopeof my invention, and hence Ido not wish to limit myself to the exactconstructions herein set forth; but,

Having fully described my invention, what I claim as new, and desire tosecure by Letters Patent, is

1. A corner-strip consisting of a bar of metal punched or cut intoshape, and comprising an outer facing-strip of substantial breadthadapted to cover an area upon one or both sides of the angle of thecorner to be protected, and a bonding device constructed and adapted tobe embedded in a body of concrete or mortar or masonry to be protected,said bonding portion being undercut or dovetailed form, largest at theend remote from the surface plate or strip whereby to insure itspermanent anchorage in the masonry.

2. A corner-strip comprising an outerbody portion having a straight orapproximately straight inner surface and a curved outer surface with ashank which extends at right specification in the presence of twosubscribangles to the inner surface, said shank coming witnesses. vprisin a, plurality of undercut members with s i iitable spaces betweenthem whereby WILLIAM MCDONALD 5 a secure anchorage in the body of cementis Witnesses:

efiected. FERD. BONSTEDT,

In testimony whereof I have signed this T. M. KEENE.

